Attachment for exhaust pipes



y 2, 1945. R. D. MAY 2,376,550

ATTACHMENT FOR EXHAUST PIPE Filed Nov. 1, 1943 Patented May 22, 1945 UNITED STATES PATENT OFFICE ATTACHMENT FOR EXHAUST PIPES Ray D. May, Portland, Oreg.

Application November 1, 1943, Serial No. 508,625 1 Claim. (or. 138-465) This invention relates generally to internal combustion engines, and particularly to an attachment for exhaust pipes therefore.

bustion engine for the purpose of reducing the injurious and unpleasant effects thereof.

The third object is to provide a means for better protecting the occupants of an automobile from exhaust gases and at the same time to better protect the exposed parts at the rear of the car from the corrosive effects of said gases.

I accomplish these and other objects in the manner set forth in the following specification as illustrated in the accompanying drawing, in which:

Fig. 1 is a verticallongitudinal section through the device.

Fig. 2 is a plan of Fig. 1.

Fig. 3 is an end elevation taken along the line 33 in Fig. 2.

Fig. 4 is a section taken along the line l4 in Fig. 2.

Similar numerals refer to-similar parts throughout the several views.

Referring in detail to the drawing, there is shown a tubular member III, which is adapted to be clamped on an exhaust pipe ll of an internal combustion engine (not shown).

The tubular member 10 extends to the tip l2 of the exhaust pipe ll. Surrounding the tubular member I is a conical section I3 of a Venturi tube 14, whose section I! may be conical or any other desired shape without departing from the spirit of this invention, it being essential, however, that the tip l2 extends to or into the section Ili'in order to produce the desired results. The section I3 may be attached to the tubular member in any convenient manner, preferably by the spokes I3a.

-. The operation of the device is as follows: Assuming that the automobile i moving in the direction indicated by the arrow it it follows that air is picked up by the section it, forcing it through the space aroundthe tip, l2. As the mo- I luting the exhaust gases from an internal comtor is being operated, exhaust gases are being driven from the tip I! through the Venturi tube It causing it to entrain still more air and this effect is still further increased by the area of reduced pressure immediately behind the section [5.

The net result of these actions is: First, to reduce the amount of back pressure on the exhaust pipe I I, offsetting partially the back pressure produced by the muiiler. Secondly, it so greatly dilutes the exhaust gases as to minimize their harmful effects on human beings as well as on the parts of the automobile and air borne vehicles,

and very importantly, by greatly increasing the velocity of the exhaust gases better disperses it into the atmosphere before it has had an opportunity to do damage to anything.

Owing to-the fact that the temperature of the parts is greatly reduced, it is less necessary to employ high grade materials, it being possible'to employ plastics for this purpose with highly satisfactory results.

While I have thus illustrated and described my invention it must be understood that. I do not intend to be limited to the precise form illustrated herein, but intend to cover all forms and modifications of the device as fall fairly within the appended claim.

I claim: In a device of the class described, the combination of a tubular member adapted to be clamped on the end of an exhaust pipe, a funnel shaped air collector concentrically supported by said tubular member having its larger end foremost and having its smaller end encircling the tip of the exhaust pipe and spaced therefrom and an oppositely turned funnel connected to the air collector in a manner to form a Venturi tube whereby the velocity of the gases issuing from said exhaust pipe will be increasedby the air picked up by the forwardly pointed funnel and further increased by the area of reduced pressure set up behind the rearwardly pointed funnel, one side of said oppositely turned funnel being in substantial alignment with the sameside of said first funnel, the rearmost end of said tubular member being the real-most end of the exhaust pipe.

RAY D. MAY. 

